"The hacker hordes of Anonymous have transferred their fickle attention to Sony. They are currently attacking the company's online Playstation store in retribution for Sony's lawsuit against PS3 hacker George Hotz. A denial of service attack has temporarily taken down playstation.com."

The rootkit wasn't intended to cause all the issues it did, ergo it wasn't trying to destroy or deface anything willfully. The fact that Sony devs were incompetent doesn't mean it was an act of vandalism.

Note that I am not arguing that what Sony has done has been in any way or form acceptable. I am just saying you're using the term 'vandalism' incorrectly.